Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.83: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

CO on NiO(001) — •Josef Grenz, Alexander Schwarz, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

Tips functionalized with CO molecules have recently been used in AFM studies to enhance the resolution to the submolecular level [1]. While investigating single CO molecules with metallic tips on different substrates various studies observed a ring-like structure (e.g. [2]). Since metallic tips should always exhibit a dipole moment [3] and CO, at least in the gas phase, also possesses a dipole moment, we attribute the observed contrast pattern to an interplay between attractive van-der-Waals and repulsive electrostatic dipole-dipole interactions. The latter should become relevant before the Pauli repulsion, which can be probed at even smaller distances.
In this contribution a detailed analyses of CO adsorbed on the bulk insulator NiO(001) will be shown. Adsorption sites, diffusion and the possibility to quantify the magnitude of the dipole moment via imaging and spectroscopy will be discussed.

[1] L. Gross, et al., Science 325, (2009) 1110.

[2] Z. Sun, et al., Phys. Rev. Lett. 106, (2011) 046104.

[3] G. Teobaldi, et al., Phys. Rev. Lett. 106, (2011) 216102.